view m4/rename.m4 @ 40177:dcd889592b62

dtoastr,ftoastr,ldtoastr: port to c-strtod changes Decouple these modules from c-strtod. Nowadays it’s reasonable to assume the C99 signatures for strtod and strtold. Programs that require stricter adherence to C99 should also use the strtod and strtold modules as needed, and we no longer need the HAVE_C99_STRTOLD macro. * NEWS: Mention this. * lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold. * m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD. * modules/dtoastr, modules/ftoastr, modules/ldtoastr: (Files): Remove m4/c-strtod.m4. (configure.ac): Do not require gl_C99_STRTOLD, which no longer exists.
author Paul Eggert <eggert@cs.ucla.edu>
date Sat, 02 Feb 2019 13:01:55 -0800
parents b06060465f09
children
line wrap: on
line source

# serial 31

# Copyright (C) 2001, 2003, 2005-2006, 2009-2019 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

dnl From Volker Borchert.
dnl Determine whether rename works for source file names with a trailing slash.
dnl The rename from SunOS 4.1.1_U1 doesn't.
dnl
dnl If it doesn't, then define RENAME_TRAILING_SLASH_BUG and arrange
dnl to compile the wrapper function.
dnl

AC_DEFUN([gl_FUNC_RENAME],
[
  AC_REQUIRE([AC_CANONICAL_HOST])
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  AC_CHECK_FUNCS_ONCE([lstat])

  dnl Solaris 11.3, AIX 7.1 mistakenly allow rename("file","name/").
  dnl NetBSD 1.6 mistakenly forbids rename("dir","name/").
  dnl FreeBSD 7.2 mistakenly allows rename("file","link-to-file/").
  dnl The Solaris bug can be worked around without stripping
  dnl trailing slash, while the NetBSD bug requires stripping;
  dnl the two conditions can be distinguished by whether hard
  dnl links are also broken.
  AC_CACHE_CHECK([whether rename honors trailing slash on destination],
    [gl_cv_func_rename_slash_dst_works],
    [rm -rf conftest.f conftest.f1 conftest.f2 conftest.d1 conftest.d2 conftest.lnk
    touch conftest.f && touch conftest.f1 && mkdir conftest.d1 ||
      AC_MSG_ERROR([cannot create temporary files])
    # Assume that if we have lstat, we can also check symlinks.
    if test $ac_cv_func_lstat = yes; then
      ln -s conftest.f conftest.lnk
    fi
    AC_RUN_IFELSE(
      [AC_LANG_PROGRAM([[
#        include <stdio.h>
#        include <stdlib.h>
         ]],
         [[int result = 0;
           if (rename ("conftest.f1", "conftest.f2/") == 0)
             result |= 1;
           if (rename ("conftest.d1", "conftest.d2/") != 0)
             result |= 2;
#if HAVE_LSTAT
           if (rename ("conftest.f", "conftest.lnk/") == 0)
             result |= 4;
#endif
           return result;
         ]])],
      [gl_cv_func_rename_slash_dst_works=yes],
      [gl_cv_func_rename_slash_dst_works=no],
      dnl When crosscompiling, assume rename is broken.
      [case "$host_os" in
                          # Guess yes on Linux systems.
         linux-* | linux) gl_cv_func_rename_slash_dst_works="guessing yes" ;;
                          # Guess yes on glibc systems.
         *-gnu*)          gl_cv_func_rename_slash_dst_works="guessing yes" ;;
                          # Guess no on native Windows.
         mingw*)          gl_cv_func_rename_slash_dst_works="guessing no" ;;
                          # If we don't know, assume the worst.
         *)               gl_cv_func_rename_slash_dst_works="guessing no" ;;
       esac
      ])
    rm -rf conftest.f conftest.f1 conftest.f2 conftest.d1 conftest.d2 conftest.lnk
  ])
  case "$gl_cv_func_rename_slash_dst_works" in
    *yes) ;;
    *)
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_TRAILING_SLASH_DEST_BUG], [1],
        [Define if rename does not correctly handle slashes on the destination
         argument, such as on Solaris 11 or NetBSD 1.6.])
      ;;
  esac

  dnl SunOS 4.1.1_U1 mistakenly forbids rename("dir/","name").
  dnl Solaris 9 mistakenly allows rename("file/","name").
  dnl FreeBSD 7.2 mistakenly allows rename("link-to-file/","name").
  dnl These bugs require stripping trailing slash to avoid corrupting
  dnl symlinks with a trailing slash.
  AC_CACHE_CHECK([whether rename honors trailing slash on source],
    [gl_cv_func_rename_slash_src_works],
    [rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.d3 conftest.lnk
    touch conftest.f && touch conftest.f1 && mkdir conftest.d1 ||
      AC_MSG_ERROR([cannot create temporary files])
    # Assume that if we have lstat, we can also check symlinks.
    if test $ac_cv_func_lstat = yes; then
      ln -s conftest.f conftest.lnk
    fi
    AC_RUN_IFELSE(
      [AC_LANG_PROGRAM([[
#        include <stdio.h>
#        include <stdlib.h>
         ]],
         [[int result = 0;
           if (rename ("conftest.f1/", "conftest.d3") == 0)
             result |= 1;
           if (rename ("conftest.d1/", "conftest.d2") != 0)
             result |= 2;
#if HAVE_LSTAT
           if (rename ("conftest.lnk/", "conftest.f") == 0)
             result |= 4;
#endif
           return result;
         ]])],
      [gl_cv_func_rename_slash_src_works=yes],
      [gl_cv_func_rename_slash_src_works=no],
      dnl When crosscompiling, assume rename is broken.
      [case "$host_os" in
                          # Guess yes on Linux systems.
         linux-* | linux) gl_cv_func_rename_slash_src_works="guessing yes" ;;
                          # Guess yes on glibc systems.
         *-gnu*)          gl_cv_func_rename_slash_src_works="guessing yes" ;;
                          # Guess yes on native Windows.
         mingw*)          gl_cv_func_rename_slash_src_works="guessing yes" ;;
                          # If we don't know, assume the worst.
         *)               gl_cv_func_rename_slash_src_works="guessing no" ;;
       esac
      ])
    rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.d3 conftest.lnk
  ])
  case "$gl_cv_func_rename_slash_src_works" in
    *yes) ;;
    *)
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_TRAILING_SLASH_SOURCE_BUG], [1],
        [Define if rename does not correctly handle slashes on the source
         argument, such as on Solaris 9 or cygwin 1.5.])
      ;;
  esac

  dnl NetBSD 1.6 and cygwin 1.5.x mistakenly reduce hard link count
  dnl on rename("h1","h2").
  dnl This bug requires stat'ting targets prior to attempting rename.
  AC_CHECK_FUNCS_ONCE([link])
  AC_CACHE_CHECK([whether rename manages hard links correctly],
    [gl_cv_func_rename_link_works],
    [if test $ac_cv_func_link = yes; then
       rm -rf conftest.f conftest.f1 conftest.f2
       if touch conftest.f conftest.f2 && ln conftest.f conftest.f1 &&
           set x `ls -i conftest.f conftest.f1` && test "$2" = "$4"; then
         AC_RUN_IFELSE(
           [AC_LANG_PROGRAM([[
#             include <errno.h>
#             include <stdio.h>
#             include <stdlib.h>
#             include <unistd.h>
              ]],
              [[int result = 0;
                if (rename ("conftest.f", "conftest.f1"))
                  result |= 1;
                if (unlink ("conftest.f1"))
                  result |= 2;

                /* Allow either the POSIX-required behavior, where the
                   previous rename kept conftest.f, or the (better) NetBSD
                   behavior, where it removed conftest.f.  */
                if (rename ("conftest.f", "conftest.f") != 0
                    && errno != ENOENT)
                  result |= 4;

                if (rename ("conftest.f1", "conftest.f1") == 0)
                  result |= 8;
                if (rename ("conftest.f2", "conftest.f2") != 0)
                  result |= 16;
                return result;
              ]])],
           [gl_cv_func_rename_link_works=yes],
           [gl_cv_func_rename_link_works=no],
           dnl When crosscompiling, assume rename is broken.
           [case "$host_os" in
                               # Guess yes on Linux systems.
              linux-* | linux) gl_cv_func_rename_link_works="guessing yes" ;;
                               # Guess yes on glibc systems.
              *-gnu*)          gl_cv_func_rename_link_works="guessing yes" ;;
                               # Guess yes on native Windows.
              mingw*)          gl_cv_func_rename_link_works="guessing yes" ;;
                               # If we don't know, assume the worst.
              *)               gl_cv_func_rename_link_works="guessing no" ;;
            esac
           ])
       else
         gl_cv_func_rename_link_works="guessing no"
       fi
       rm -rf conftest.f conftest.f1 conftest.f2
     else
       gl_cv_func_rename_link_works=yes
     fi
    ])
  case "$gl_cv_func_rename_link_works" in
    *yes) ;;
    *)
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_HARD_LINK_BUG], [1],
        [Define if rename fails to leave hard links alone, as on NetBSD 1.6
         or Cygwin 1.5.])
      ;;
  esac

  dnl Cygwin 1.5.x mistakenly allows rename("dir","file").
  dnl mingw mistakenly forbids rename("dir1","dir2").
  dnl These bugs require stripping trailing slash to avoid corrupting
  dnl symlinks with a trailing slash.
  AC_CACHE_CHECK([whether rename manages existing destinations correctly],
    [gl_cv_func_rename_dest_works],
    [rm -rf conftest.f conftest.d1 conftest.d2
    touch conftest.f && mkdir conftest.d1 conftest.d2 ||
      AC_MSG_ERROR([cannot create temporary files])
    AC_RUN_IFELSE(
      [AC_LANG_PROGRAM([[
#        include <stdio.h>
#        include <stdlib.h>
         ]],
         [[int result = 0;
           if (rename ("conftest.d1", "conftest.d2") != 0)
             result |= 1;
           if (rename ("conftest.d2", "conftest.f") == 0)
             result |= 2;
           return result;
         ]])],
      [gl_cv_func_rename_dest_works=yes],
      [gl_cv_func_rename_dest_works=no],
      dnl When crosscompiling, assume rename is broken.
      [case "$host_os" in
                          # Guess yes on Linux systems.
         linux-* | linux) gl_cv_func_rename_dest_works="guessing yes" ;;
                          # Guess yes on glibc systems.
         *-gnu*)          gl_cv_func_rename_dest_works="guessing yes" ;;
                          # Guess no on native Windows.
         mingw*)          gl_cv_func_rename_dest_works="guessing no" ;;
                          # If we don't know, assume the worst.
         *)               gl_cv_func_rename_dest_works="guessing no" ;;
       esac
      ])
    rm -rf conftest.f conftest.d1 conftest.d2
  ])
  case "$gl_cv_func_rename_dest_works" in
    *yes) ;;
    *)
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_DEST_EXISTS_BUG], [1],
        [Define if rename does not work when the destination file exists,
         as on Cygwin 1.5 or Windows.])
      ;;
  esac
])